Introduction to Xishan No. 1: The most precious stone carvings in Sanxi are the three inscriptions by Zhu Xi of the Song Dynasty, which are "No. 1 in Xishan", "Source of Living Water" and "Flying Kite and Fish Leaping". It is a pity that it suffered the catastrophe of the Cultural Revolution, and what we see today as "the best in Khe Sanh" was later made up for.